"We had an unbelievable connection as two humans who just admire things about each other, and see something in each other that's beautiful," Jonas says about the stunning blonde. "Out of my best effort to respect her and her privacy, I'm not going to say if we had sex or not. But we did have a beautiful connection."

"Even now I have so much admiration and respect," he adds. "She’s amazing.”

Still, he insists he's single. The "Chains" singer split from former Miss Universe Olivia Culpo last June, after nearly two years together.

"My current situation is that I'm very much single, but I'm trying to be as open to people who can inspire me in some way," Jonas stresses.

And clearly, he's looking. Jonas admits that he's sent some Instagram DMs to ladies.

"Slide right in there sometimes," he says. "And then you'll text the person and finally meet the person. It's like online dating. Even that freaks me the f**k out. I'm like, should it be a group? Just the person?"

The former Disney star -- whose celeb crushes include Shania Twain, Emilia Clarke, Amy Schumer, and Jennifer Lawrence -- says he's "the most free" in his life that he's ever been.

"Career-wise I don’t feel trapped," he explains. "I feel great. And as far as me, Nick, as a person, I feel the most free."